Hi to everyone again, hope you’re doing great. I need your advice, i want to use my original stereo but the sound isnt that good. Im using an fm transmitter so that i can play music via Bluetooth phone with Spotify. Can i connect an amplifier with the headunit?
A couple years ago I was getting tired of keeping up with the CD’s and their cartridges for my '93 3000GT. I was also plugging my cell phone into the AUX jack on the front of my factory entertainment system and playing music from it. The sound wasn’t near as good as it was when I originally got the car when it was new back in 1993. The rear speakers really sounded bad.
There is a nice place in Virginia of the United States that I have been purchasing music and TV systems from since the mid 1970’s, https://www.crutchfield.com/. They can tell you exactly what systems and speakers will fit in your car and they also supply free adapters and wiring adapters that make it easy to install their systems into your car. I also was interested in the ability in having a rear camera displayed on the head unit and also built-in GPS so I didn’t have to keep looking at the small screen on my phone. I also had digitized all my music CD’s to lossless .flac files that I was playing from my phone instead of using the CD’s themselves. The Kenwood unit the I picked has a micro SD card slot on the front of it in the upper left corner so that I have four or five micro SD cards that I keep in the car and with my play lists on them and change them every now and then.
Crutchfield doesn’t have speakers that will work in the dash unless you make adapters, but I found some at Parts Express that fit exactly. I just took the metal screens off of my original dash speakers and mounted them to the new ones from Parts Express. Here are those: Dayton Audio RS75-4 3" Reference Full-Range Driver 4 Ohm.
My system is much better now and it sounds great, but it’s all new. My phone now automatically connects via Bluetooth when I get into the car and I can just put it in the center console. The new system came with a microphone that I mounted behind the steering wheel.
I will try to include a picture of the head unit.
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Changing the head unit is the best way to do, but my gto is passed as a classic so that its very nice to have the original stereo still working, and mine is with the graphic equaliser, which for that time was a beautiful scenery. 
That’s the main reason why im going to stick with the headunit.
Then keep the original head unit and either re-cone your existing speakers or purchase new ones. The new door speakers that I purchased from Crutchfield were a little smaller than the originals and if you can follow Joe’s instructions on how to re-cone your existing speakers they will sound a lot better than they do now and as good as new replacements.
I don’t believe you need an amplifier if you get your speakers upgraded or repaired. The little dash speakers would be very hard to re-cone, so I suggest getting the replacements from Parts-Express.
You could easily add a small amplifier to help the sound. You can get a low line converter which transfers your speaker lines to RCA style cables. Those would then get into an amp.
So i can use an amplifier with my headunit? I already changed all the six speakers i bought JL audio. What do i need exactly to connect the amp with the headunit?
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This pic is like mine
Something like this Amazon.com would do the job. You would tap into the factory speaker wires to input into the converter, then use that as inputs into an amp via RCA jacks.
Thanks alot, will try it for sure.
Nice setup 
, and the headunit looks very nice.
Today i want to car stereo installer, and gave me another good idea which i think im going for it. I will use a small amplifier which i can connect with the headunit by using the same wiring and plugs.
PIONEER | GM-D10054 this amplifier is going to do the trick.
Can you show a picture of it mounted in vehicle when you get it installed?
Yeah sure, i need to wait for a cable return to the headunit, it had to be ordered.
So all it is is that that amp has a built in line converter instead of doing an external line converter to the amp.
Either way you have to tap into the factory harness to connect it. Personally it would be simpler to do the external line converter because you could keep the converter behind the radio and run your rca cables wherever to get to the amp. It will open up your options on the amp too
No its better to use this amplifier, coz its small and it can be fitted behind the console and your are free from passing phonos, remote wire, pos and neg wires to an external amplifier. All you need is this amplifier and couple of plugs the one from head unit goes to the amp and from the amp back the headunit. No extra wires needed to switch on the amp. The only cons is that the amplifier is small so you are not going to have alot of extra wattage, it just to improve the existing sound.
Which is why I said its better to use the other line converter because your amp options open up. Running remote, power, and ground cables are simple in a 3s.
Yep you’re right, that will be my last resource.